A step force generating device for dynamic calibration of force sensor

Abstract

The invention provides a step force generating device for dynamic calibration of a force sensor, wherein the step force generating device is suitable for dynamic calibration experiment of a force sensor having an irregular tool structure of a load terminal or needing to carry out loading of a plurality of directive forces / torques. The step force generating device comprises a calibration table, a directional loading assembly, a steel force transmission wire, a force source, a pulley suspension system, an impact shearing device and a step edge detection circuit. A stable load is applied to a force sensor by using the directional loading assembly based on steel wire force transmission; and the steel force transmission wire is impacted and sheared suddenly to carry out step unloading on the force sensor to realize negative step excitation on the force sensor. The impact shearing device uses a high-speed and large-impact-force impact cylinder as an impact execution mechanism to extend a dynamic calibration frequency and a load range of the force sensor. With cooperation of an impact gasket block, the disturbance during the impact shearing process can be suppressed, so that the dynamic calibration precision can be improved. The step edge detection circuit obtains step edge time based on starting steel force transmission wire contact time by a detection impact head and a steel force transmission wire shearing time.

Description

technical field [0001] The invention relates to the field of sensor testing, and is a step force generating device for dynamic calibration of force sensors, in particular, a dynamic calibration of force sensors suitable for irregular load-end tooling structures or requiring force / torque loading in multiple directions The experimental step force generating device is used to realize the accurate step response dynamic calibration of the force sensor. Background technique [0002] The step response experiment is widely used in the dynamic calibration experiment of the force sensor, and its key technology lies in the generation of the step force. For the step force, its amplitude determines the range of the sensor that can be calibrated, and its step edge time determines the bandwidth of the sensor that can be calibrated. Therefore, the generation of large force value and broadband step force is the key to the dynamic calibration experiment of the force sensor step response. In...

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Problems solved by technology

In the existing research, aiming at the fracture method of brittle materials, the literature "Evaluation of the Rise Time of a Negative Step Force Source" (Liang Zhiguo, Meng Xiaofeng. Evaluation of the Rise Time of a Negative Step Force Source[J]. Measurement Technology, 2008 , (6): 13-15) discloses a method for measuring the edge time of negative step force, but it is difficult for the step force generation method to be applicable to the irregular structure of the load end tooling or the need for multiple directions of force / Step response experiment of a force sensor loaded with moment

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